64 



S O T E N. 



which can hardly be confounded with any other. 

 The teeth, though differing in the species, are 

 very unlike those of the Tellinae, which most re- 

 semble some individuals of the genus in external 

 characters. 



Specimens of the oval and linear forms are pre- 

 sented in the plate 3 but they have not been divided 

 into sections, because there exist intermediate spe- 

 cies which it might be difficult to exclude from 

 cither. 



The name Solen is derived from (toqXyiv, a tube. 

 The Latin appellation Unguis, by which this family 

 has sometimes been designated, was probably given 

 on account of the nail- like or horny substance and 

 colour of many of the species. By the French 

 the shells have been called Manches de Cputeaux, 

 in allusion to their shape. 



